2014年8月3日云南鲁甸地震强地面运动初步模拟及烈度预测

2014年8月3日云南省昭通市鲁甸县发生了M_s6.5级地震.在已知的三维介质模型、地形数据基础上，利用震源运动学初步反演模型（张勇等，2014），作者采用曲线坐标网格三维曲线有限差分方法模拟了鲁甸地震波场传播过程，并计算了模拟区域地震烈度分布.结果表明：地震最大烈度为Ⅶ度，破坏主要集中在鲁甸县以及巧家县、会泽县靠近鲁甸县的边界.另外，模拟结果还显示地震动在山峰、山脊处具有较大的幅度.计算表明断层东北侧的低速沉积盆地的波动放大效应加强了该地区的地震灾害.

Preliminary simulation of strong ground motion for Ludian,Yunnan earthquake of 3 August 2014, and hazard implication

An M_s6.5 earthquake occurred at Lundian county, Yunnan province on August 3, 2014. With the available three-dimensional velocity model and topography data, as well as the preliminarily inverted kinematic source model (Zhang et al. 2014), we simulated the seismic wave propagation of Ludian earthquake with 3D curved grids finite-difference method, and calculated the distribution of seismic intensity for the modeling region. The simulated results reveal that the highest seismic intensity caused by this earthquake is about degree 7, mainly in Lundian County and the boundaries between Ludian County and Qiaojia and Huize County. The simulation result also implies that ground motion has large amplitudes at the mountain peaks and ridges. The numerical modeling indicates that the amplification effect of low velocity basin at the northeastern of the earthquake fault may aggravate the seismic hazard.